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saxman · 09-13-2007, 08:16 PM

Black oxide. It's black because the surface is etched before treatment. If it were polished, you would see the blue hues. Industry uses a lot of Manganese Phosphate too.

09-13-2007, 08:16 PM	#2
saxman User Join Date: Jun 2002 Posts: 301 Thanks: 0 Thanked 0 Times in 0 Posts	Black oxide. It's black because the surface is etched before treatment. If it were polished, you would see the blue hues. Industry uses a lot of Manganese Phosphate too. __________________ You can lead 'em to the water, but you can't make 'em drink.